Perhaps NZ isn't has liberal as the Netherlands, where everyone knows weed is not condoned but not illegal either. Still, I didn't realise we were liberal enough to legalise cannabis for 1 day each year. That day was yesterday. According to an acquaintance who smokes all sorts of stuff, on this day many people gather at the octagon smoking cannabis...and there'll be many who deliberately smoke in front of the police stations simply coz de police can't do anything about it.
It's funny the way the human mind works. We find it exciting to do the forbidden, proud if no one can stop us, thrilling when there is a risk of getting caught. Lots of people think that the Netherlands would be full of drug addicts given their liberal laws, but in reality, that's not the case. It's probably the tourists who'd make up the bulk of those who take advantage of the law. Again it's the whole psychology thing whereby people do it coz it's illegal, but if it's legal everyday, less find it a thrilling act.
Certainly there's a whole debate on whether or not legalising certain stuff would act in reverse psychology on people. I'm not saying that we should legalise drugs and all sorts of stuff coz there are those that do need to be controlled, but I think that legalising certain things together with public education may be helpful.